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PRODUCT DATA Date: March 2005 Information Sheet No.: B2064-2 EVO-PLAS TENSOL 70 USER GUIDE DESCRIPTION Tensol 70 is a two component, acrylic adhesive which hardens at room temperature by the polymerisation of the Part A. The Part A is a viscous mixture of acrylic polymer dissolved in monomer. The Part B is a liquid catalyst solution that initiates the polymerisation of the Part A. RECOMMENDED USE Tensol 70 is designed for bonding cast acrylic sheet. It will also bond extruded acrylic sheet, but will cause surface crazing and stress cracking of the sheet unless the sheet is annealed prior to bonding. The bonds obtained using Tensol 70 are of approximately the same strength as the acrylic sheet. Typical joint strengths are 35 MPa for a cold cured joint and 45 MPa for a post cure heat treated joint. METHOD OF USE Before using Tensol 70 the Part A must be at 20oC and the workroom must be at 20±5oC to obtain the optimum cure rate and properties of the adhesive. Surfaces to be bonded should be clean, dry and dust free. If necessary they can be cleaned with petroleum ether or white spirit then washed with water. The minimum film thickness that can be successfully used is 5 thou ( 0.13 mm ) thick. Since the adhesive shrinks on curing allowance must be made for this when making butt joints and fillet joints. When bonding edge to face the edge should have a 10o chamfer to allow a sufficient quantity of adhesive into the joint. Accurately weigh 5 parts of Part B into 100 parts of Part A. It is important that this is done accurately otherwise the adhesive will not cure properly and will give inferior performance. Thoroughly mix the adhesive by stirring, taking care to entrap as little air in the adhesive as possible. The mixed adhesive must be used with 20 minutes of mixing. Cover the container and allow the mixed adhesive to stand for 5 minutes to allow the larger air bubbles to rise to the surface of the adhesive. Do not use adhesive that has been mixed for more than 20 minutes as it will be difficult to use and give inferior final performance. The adhesive will be hardened sufficiently within one and a half hours to allow careful handling of the assembly . After 4 hours cure the parts can be lightly machined but, for the best results, the joint should be left to cure for 24 hours before further processing. Once the adhesive has set the final bond strength can be increased by heat curing the material. This can only be done at least one hour after the adhesive has set. Non-thermoformed components can be heated for 3 to 4 hours at 80oC. Thermoformed, highly stretched components may be heated for 4 to 5 hours at 70oC . This Product Data Sheet covers just one of a large range of products supplied by Bostik Limited. Full information on these products and advice on application is freely available from our fully trained staff throughout the country. In addition, specialist technical advice is available from our Technical Services Department. This Product Data Sheet supersedes all previous technical information on this product, and users of it are cautioned to ensure that it is the current issue. Destroy all previous Product Data Sheets, and if any doubt, contact Bostik Limited, quoting the code number in the top right hand corner on the front of this document. This leaflet is for general guidance only and may contain inappropriate information under particular conditions of use. The company cannot accept any responsibility for loss or damage that may result from the use of this information, due to the possibility of variations of processing or working conditions and of workmanship outside our control. Users are advised to confirm the suitability of this product by their own tests. Bostik Ulverscroft Road, Leicester, LE4 6BW England. Tel: +44 (0) 1785 272727 Fax: +44 (0) 116 253 1943 www.Bostik.co.uk BOSTIK, EVO-STIK, CEMENTONE & IDENDEN ARE REGISTERED TRADEMARKS OF BOSTIK LIMITED. Page 1 of 1
